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I asked him to send me just one that he knows didn't go through and he sent me:
Which he said should be Ben Bova's Mars, ISBN: 0-553-56241-X. Unfortunately, the CueCat translation turns into 783006508X, which is very far off from the ISBN.
Could this be a case where the book has a UPC different from the ISBN? I recall something about this paperbacks in particular.
But decoding the CueCat scan here I get a UPC code of 076783006508 which isn't an ISBN - but is a UPC code used by Bantam books (see here - and for more than one book according to Google.
I'd guess that the user has scanned the product codes on the back covers of his mass market paperbacks and not the ISBN from inside the front cover.
PS You really should send out copies of the CueCat guide with each CueCat!! :-)
Either way I'll have to wait till I get home from work to check.
The mass-market paperback have the ISBNs on the inside front cover because when they are returned for credit only the cover is sent.
Real ISBN codes come out of the script as type "IBN", "IB5" (ISBN plus 5 - the five digit pricing bit that's after an ISBN) or "IB2" (ISBN plus 2 - usually a case of getting only part of the price, but in this case we don't care about that part of the barcode anyway. I've never seen real ISBN plus 2 barcodes in the wild)
Anyway, "UPA" is the UPC-A barcode format.