I worked at Unix System Labs, and I can offer some clues, as I just stumbled across this thread when searching for something related.
First, the AT&T PC6300 and successors were "not quite IBM-PC compatible" Olivetti made these boxes, and re-branded them for AT&T, and it was perhaps the worst thing A&T had sold since "Dataphone II".
Because they were not quite compatible, they would not run many applications. It was embarrassing. So much so, I left the part of AT&T that sold the computers (and the low-end PBX systems, Like "System 25", too) and got a job with the Unix Systems Operation division of AT&T Bell Labs.
Unix "on the desktop" was a wet dream of the VPs, and those of us who actually worked for a living had to dissuade them from promising too much to the AT&T board. USO was making money off licensing fees, and if ANYONE was going to make a minimal port of Unix run on the desktop, it was going to be Phoenix (who made a very good clone PC BIOS that Olivetti should have used in the PC6300), or Microsoft, (with "Xenix") or SCO (partly owned by Microsoft? majority owned by Microsoft? Doug and Larry Michaels would not say, but we had our suspicisions).
But Phoenix saw things as we did, and waited for hotter hardware.
The AT&T "3B1" (aka "Unix PC", aka "AT&T 7300") was the hotter hardware. It was a workstation with a Motorola 68010 running at a blistering 10Mhz. But it sold for workstation prices.
But there were still standing orders to release "a binary" that would run on IBM PCs, as the marketing folks were utterly certain that we would be able to recruit "systems integrators" as licensees for a pre-compiled binary.
So, there was ONE binary for the AT&T 6300s, and a SECOND for the true IBM PC, as AT&T did not want to see us only put out something that would not run on AT&T's own PC offering.
So yep, what the photo shows is legit "production binaries", but I do not think anyone treated them as anything but a curisosity, which is likely why they were preserved in a box, rather than kept with the source code in various tape vaults.
SCO Unix was the default choice for the "hobbyist market", as they priced their software appropriately. Problem is, Doug and Larry lied a LOT in their royalty statements, and so did Steve Balmer, so the low prices were only possible because both SCO and Microsoft were under-reporting and under-paying. We audited, they'd pay up, we'd wait a bit, and audit again... but you really can't sue some of your best customers, can you?
Me? I had a BLIT (aka 5620) on my desk, with its elegant red round mouse which was connected to one of the many 3B2s and VAXen we had around, and I had a 3b1 on a side table, and my laptop was the AT&T "Safari" laptop, with the cool little LCD screen that told me if I had new email even when the cover was closed. But I never even tried to boot Unix on a PC, as we had a joke:
Name 3 Famous Dogs
OK, Lassie, Rin-Tin-Tin, and Desktop PC Unix
