I was FLOORED when I saw those laser eyes staring at me from the bag!
Don't hurt yourself by patting yourself on the back too. Likewise don't bite down when smiling, your ear will be at risk.
"The bag" means there is a story, so tell it, please!
There has been one on eBay
at $2000 over full catalog of $750. It is just the one and one of the three NOT faulty. See below.
On 12-14-2016 Seigel's lot 667, sale 1145 sold for $550 against a Scott Catalog of $350. Est. was $1000-1500. This is the only 2540b they have offered.
In one of the Kelleher Sales of Lang's material, Sale - 752 The William S. Langs Stock & Private Holdings, Part 4: U.S. Errors, Freaks and Oddities - February 23-24, 2021, lot 2727 was described as, "1991, $2.90 Eagle, black (engraved) omitted (Scott 2540b), single from plate number position, o.g., never hinged; creases and tiny gum disturbance as most have, Very Fine, only 20 reported and only stamp from plate number position, 17 of the reported examples are faulty." This example had visible damage and went unsold.
If yours are as sound as they seem to be, you will be changing the undamaged quantity significantly. Understand two things. First the key stamp is the corner without the engraved plate number because black is missing. Next yours (if/when good) is the only intact plate number block of four. You need to keep it that way and it should run more than the price of four stamps plus the missing plate number stamp premium. Perhaps after your good certificate, advise Scott and see if they will list the color missing 2540b as a plate block.Now the real question is where is the rest of the 14 stamps from your right side pane?