Suspicions, but what kind? All I can think is that they might think it was dug up somewhere, which it would have been, and the police might check into it, and find no reports of anything missing?
It might be valuable antique money. Silver certificates, that's something old bills were likely to be back then. I remember they were being called in, to be destroyed maybe, but you got a nice payment. Collectors might pay more. "Quentin" dig it up on Collins ground....
That took gall, bringing up Carl (who explained all about her dual identity to "real" Barn I wonder? How long did it take, while Barn feigned befuddlement?!) to Pansy, though does anyone really think she's Pansy who is grieving for Carl? Petofi maybe. Barnabas seems made of gall, sometimes.
I only remember the yellowness of 1969 Q, except of course ties were widening. I did think then, though, that by then, they needed to widen, within reason. It was all that counteracted the Poindexterish-ness of earlier 60s suits.