It's very irritating when people are dealing with these things seemingly without any idea of ESD.
Legendary is a situation where seller has opened the package and placed components on what ever surface, beside the package.
One other thing, I don't understand this ROM access time uncertainty, it's just a memory.
Maybe it's an understanding of not available, it's not complete, something is always available.
If you upgrade a computer memory you're checking how fast replacement is still accessed faster.
Last time I bought 256k 28-series EEPROMs.
They are also drop in replacements for 64k and 128k of 27-series.
Of course for non authentic cases only.