Are these really "oversize proof" cards?

Hi @mlbfan2 ! Generally speaking, I tend to believe that any oversized proofs are cut from sheets. It doesn't mean they aren't "oversized proofs", but that is where definitions can get a bit tricky. This is standard nomenclature for such pieces nowadays, though technically, they were likely not used for proofing purposes. In fact, Topps actually used to sell sets of uncut sheets and are pretty easily found. That is likely what the seller here did. I've done it too, and think it is a great oddity for player collectors to add if they want something different.

With all that said, there are pieces that have been cut from sheets which are the very definition of proofs - for example, I have a 1995 Stadium Club insert card that actually has a bright green sticker on the back for approval purposes before Stadium Club was released. It is neat because you can physically tell that it is used in the proofing process. Many others may simply have never made it to the cutting machine at the factory for whatever reason (used for proofing, mistakes were found, qc etc.) but in the end, from a presentation perspective, many times, they can all look the same. It is truly up to the collector if they want to add things like this to their collection. Once upon a time, I was RABID about this stuff ... now? Not really so much.

Just sheet cut scrap.