Could you post a picture of them? It may help...
In my
experience, as long as you can feel a bulb when you squeeze it, they’ll grow ok.
Also, if your bed you’re gonna plant them in is ready, you can plant them, even if temps dip below feezing. They’re pretty hardy.
You can also wait, if you’re more comfortable that way, or soil is not workable.
Definitely let air get into whatever container you have them in, if you will not plant them for a while.
I love onion sets. Such an easy way to get yummy onions.