Maybe USA's decision to not air episodes that promoted the time slot change probably had Peter mention that Card Sharks was moving into Press Your Luck's former time slot. But keep in mind that this claim, along with other claims, are just claims on their parts.
This is just speculation on my part, but I think the reason why USA never aired clusters of episodes from the run was probably because of USA picking up the rights to about 50 or so episodes at a time and getting fresh episodes every 6 months, and if this is true, then that may explain why there were periods from the run that never aired on USA Network (including the first 11 episodes, May and early June 1984, multiple weeks from March 1986, the final month of the series, etc.). I think GSN is taking much better care of Press Your Luck than USA did.