Congratulation Shane. You did am amazing job cleaning up the backs.
For me, the Topps 55 Hocus set has been the hardest Topps baseball set actually issued at retail to complete. I have finished the 48 Magic Photos and the 56 Hocus Focus but am still short two of the 55s. There are tougher unissued Topps test sets but the 55 HFs are extremely scarce. Probably because they were small, ugly, hand cut, often underdeveloped and fragile