Stop in for a cup of coffee

I think I've been scammed.
Bought a flip cap and adapter about 5 plus weeks ago. Used but that was OK.
Parts came.small usps box. Mailman hands it to me. I was home.
Box feels empty.
Doesn't have any damage
I ask him to wait a second open it. Just the adapter. No cap,
Message the seller not possible I did have to jam it in the box one side bulged out some and I wrapped and taped them both together.
Well box does have a bulge, he said he would file a claim.after he came back in town. That was weeks ago .Meanwhile I bought a flip cap. No way in he'll it will fit in a small usps. Ships it fits box.
Crap