We were in a similar situation with some other baby equipment. A friend wanted to sell us her pink bouncer and high chair before we knew the gender. I was so dead-set that this was a boy but DH and I kept forcing ourselves to say "well, it won't kill a boy to be in pink stuff." But then I realized that there will most likely be many pictures of them in the bouncer and high chair, and those pictures will last forever. Even though they won't know the difference as a baby, somewhere down the line they will see the pictures and they may question or be embarrassed.
In our case, that friend suddenly stopped responding to any messages I sent her about buying them and I suspect she sold them to someone else, so that sort of resolved itself.