I usually don't have multiple offers at the same time.. but you don't have to mention the timing. I can honestly say that I've received offers from companies X,

I usually don't have multiple offers at the same time.. but you don't have to mention the timing. I can honestly say that I've received offers from companies X, Y, and Z - even if all three were in the past and I already turned down all three of them. It's not as good as having them all at the same time, but it's better than nothing.