Read the whole thread, or at least a little bit of it, or maybe even just the OP before posting. GrrrR! Sorry, pet hate.
Anyhoo, yes, I’d offer to go halfies on a pop-lock. Cheaper than return postage (probably) and will put you safely on the moral high ground.
I’ve swallowed some awful cr@p from clasifieds over the years on the grounds that complaining is generally more trouble than it’s worth. But for a set of forks, I would probably feel a liitle aggreived if I couldn’t fit the forks and expect them to work.
If they’re sold with a piece missing which prevents their immediate useability, I’d be miffed unless it was made very clear in the advert.