TC80 — total due for EVERY document in the "Plant & Freight Hire Invoices" collection (20 documents as of 2026-10-06)
Column "Source PDF total due" = read directly from the source PDF (ground truth). Currency as printed on the document.
Threshold in the question: total due over 2,500.

#   Doc id (first 8)  File name in collection                                  Added        Source PDF total due   Over 2,500?
1   661d269b          Calderwood_Freight_S66_S67_S72.pdf                         Sep 24 2026  £822.00                no
2   d45aa7f4          Calderwood_Freight_S66_S67_S72.pdf                         Sep 21 2026  £822.00                no
3   fef35859          Calderwood_Freight_S66_S67_S72.pdf                         Sep 21 2026  £822.00                no
4   f7ddaf58          Calderwood_Freight_S66_S67_S72.pdf                         Sep 21 2026  £822.00                no
5   29c942d0          Calderwood_Freight_S66_S67_S72.pdf                         Sep 21 2026  £822.00                no
6   0b0bd090          Baseline_receipt.pdf                                       Sep 21 2026  $90.10                 no
7   135310f9          SiblingA1_Thistlewood_PlantHire.pdf                        Sep 21 2026  £1,754.40              no
8   886070d1          SiblingA1_Thistlewood_PlantHire_-_Scanned_Twin.pdf         Sep 21 2026  £1,754.40 (scanned copy of #7)  no
9   129f1ba9          invoice_HIS-4402_-_Digital_Scanned_Digital.pdf             Sep 21 2026  £1,246.80              no
10  3721a82a          TC1_TC4_TC5A_baseline_receipt.pdf                          Sep 21 2026  $90.10                 no
11  45a86024          main_invoice_multipage_blackwood.pdf                       Sep 19 2026  £6,591.24              YES
12  5b3bc71c          Calderwood_Freight_S66_S67_S72.pdf                         Sep 19 2026  £822.00                no
13  e6290e0c          TC8_total_row_lookalike.pdf                                Sep 19 2026  £1,982.00              no
14  75285524          main_invoice_multipage_blackwood.pdf                       Sep 19 2026  £6,591.24              YES
15  fb667677          SiblingA1_Thistlewood_PlantHire_-_Scanned_Twin.pdf         Sep 19 2026  £1,754.40 (scanned copy of #7)  no
16  80746437          SiblingA1_Thistlewood_PlantHire.pdf                        Sep 19 2026  £1,754.40              no
17  a8bbd31e          TC5B_altlabel_receipt.pdf                                  Sep 18 2026  $227.33                no
18  073a4399          TC5C_altlayout_receipt.pdf                                 Sep 18 2026  $157.50                no
19  cbb19486          TC1_TC4_TC5A_baseline_receipt_1.pdf                        Sep 18 2026  $90.10                 no
20  dd1200e5          Calderwood_Freight_S66_S67_S72.pdf                         Sep 18 2026  £822.00                no

Result: 20 documents (11 distinct source files). The only documents over 2,500 are the two uploads of main_invoice_multipage_blackwood.pdf (#11 and #14), total £6,591.24. All 18 others are at or below £1,982.00. Nothing over 2,500 can have been missed.

Source files read: Calderwood_Freight_S66_S67_S72.pdf (Total Due £822.00), SiblingA1_Thistlewood_PlantHire.pdf (Total Due £1,754.40), main_invoice_multipage_blackwood.pdf (TOTAL £6,591.24),
TC8_total_row_lookalike.pdf (Total £1,982.00), invoice_HIS-4402 (Total due £1,246.80), TC5B (Amount Due $227.33), TC5C (Total Due USD 157.50), baseline receipt (Total $90.10).
The scanned twin is an image-only copy of the Thistlewood invoice (same content, £1,754.40).

--- Tool's own answer, same collection, new chat, 2026-10-06 ("List the total due for every document in this collection, one line per document (file name and total due).") ---
Read 8 documents (of 20), 8 sources:
Calderwood_Freight_S66_S67_S72.pdf — Total due not surfaced
SiblingA1_Thistlewood_PlantHire.pdf — £1,754.40
SiblingA1_Thistlewood_PlantHire_-Scanned_Twin.pdf — £1,754.40
TC1_TC4_TC5A_baseline_receipt.pdf — Total due not surfaced
TC1_TC4_TC5A_baseline_receipt_1.pdf — $90.10
Baseline_receipt.pdf — $90.10
main_invoice_multipage_blackwood.pdf — £6,591.24
invoice_HIS-4402-_Digital_Scanned_Digital.pdf — £1,246.80
TC5B_altlabel_receipt.pdf — $227.33
TC8_total_row_lookalike.pdf — £1,982.00
TC5C_altlayout_receipt.pdf — $157.50
Every value the tool did report matches the source PDFs. It folded the repeated uploads into one line per file name, and reported "not surfaced" for two files whose totals are in the PDFs (£822.00 and $90.10).