I'm guessing the hole in the back corresponds to the strap button by the tailpiece; why the they decided the latter worked & the former had to go, I'm clueless (well, OK, if I were to be unkind, I'd perhaps suggest that I am not, in fact, the clueless one in this equation.....)
And I fear to imagine what the faux TRC hides; given the overall state of the instrument, mayhap someone decided it needed a set-up and went excavating for the adjustment nut?
Peter (who will gladly let Greg drop the coin to find out.........)