They did add the Let's Go Pikachu/Eevee ones after the games had been out for a year, but as far as I can tell that was a fluke. Can't think of any other situations where it's happened, at least. I was hoping for it to happen again on Luigi's Mansion 3 but that never came to fruition.
Yep, but the situation is different with that and here. With let's go, they never offered an bonus item initially. Here they are, which is why I'm pretty convinced it's doubtful they will suddenly add or switch a steelbook in.
I would love to be wrong, but historically, Best Buy tends to follow their their precedents.