Neither LOVEppears nor appears had first-press bonuses... everything that seems like it would be a bonus has appeared on every official copy of the release since its initial pressing in 1999.
As for posters, I've never seen any for the appears single by itself, but here are two magazine advertisements:
Horizontal one from anascans; vertical one from angel-ayu.
And here's a poster advertising both LOVEppears and appears:
(Forgive me, I've forgotten the source for that image - probably an auction though, if the source isn't in the filename)