Experience selling sealed boxes?

Hi everyone,

I was debating pre-ordering a case of something 26-27 when available, maybe a series 2 or OPCP. I'd open maybe 2-3 of the boxes and then sell the rest, ideally to a dealer all at once for like 85% market since it seems boxes just get more expensive after release. I know in Pokémon selling sealed is a lot more common, but I haven't seen many posts about it for hockey/sports cards. Has anyone had any luck doing this or has any advice? Ideally I'd want it to cover a box or two.