I would probably just think of it as two lots from a single transaction.
If I'd bought them at an in person auction that's what they would be.
I'd keep both, even viewed individually, sometimes things work out, sometimes they don't.
A couple examples,
I bought a big batch of British cigarette cards on ebay. Probably a couple thousand. They're usually found in sets, and nice condition. These were not listed as sets of being in good shape, and in fact weren't. They were as the pics showed. Still a big bunch of pretty neat stuff.
ANd the packing material! at first I was nervous, as it appeared to be a large flat rate box full of 91 Score baseball..... Some of which had gotten damaged when the box bounced around the postal service. The lot I bought was buried inside the sacrificial junk wax.
And on the bottom? A complete 92 score set in a binder and pages.
I sold the "packing material" at a yard sale for more than the whole lot plus shipping.
Bought a block of four stamps for a pretty good price. Dealer that has a rep for not exactly having proper descriptions, but who does huge volume and misses varieties often enough to keep an eye on.
Package arrives, and it was a block at one point, but isn't it's two pairs. Looked closely at the scans, and knowing it's not really a block I can see how the listing employee carefully place them to look like the block it was advertised as.
Now the catch. One of the stamps has a variety I want. The catalog value for a block is a lot more than I paid, but the catalog value for two hinged singles and two not hinged singles is higher still. So I didn't get what I expected, but actually got a more valuable group of stamps. that were the exact ones I'd bid on... (I did sort of really want a block thought... )
I called them like their listings say "any problems call us!" Ok then.
Laid it all out for him, and he was like "and? What do you want? " I told him I would keep them, but wanted him to know about the underhanded listing as someone else would probably not do the math a make a whole thing out of it. (and maybe just maybe some understanding and a free shipping coupon or a small discount- even lie $1-2 would have been cool. )
Nope, he seemed annoyed. Like literally "ok, whatever. what else can I do for you?"
Just said nope just wanted you to know like your listings say, any problem call us. Bye.