IMO, no, it is not safe to assume that.

"Illegals" are IDed chips from a known illegal operation.

UFC's are unIDed chips.
IMO, UFC's should never be called "Illegals."

Keep in mind, most illegals closed pre 1961.
Paul-Son did not start chip production until well after that.

A good guess is, the LER is a home game chip.
But, both of yours could be Las Vegas Nite companies. Paul-Son made a lot of that type of chips.