The auctions have closed, they all brought a little under $200 each.
The best of the group was the Schermack type I. The Mekeel handstamp on the back were his guarantee that they were purchased directly from the Schermack company. That handstamp is almost as good as an expert certificate. Catalog Value $500 and a pretty good buy at $200.
The other two are pretty shakey. The Farwell looks real bad. Scott's doesn't even list a block of 4 as known. Genuine pairs are very scarce and CV of over a $1000. If legitimate this block would be worth thousands and never offered on
ebay.
The 320 Mailometer block isn't much better. The center holes are way out of alignment, plus Mailometer type IV wasn't even in production until several years after the 320 issue. This block is also not listed in Scott's. I suppose it could have been made as a request item on the sly, but it looks like the guy that perforated was drunk when he did it. Maybe that's how they talked him into doing it. I sure wouldn't want the block.