I have to agree. We just purchased a 2 year old home (we just moved from Naples, FL). The former owners had Christmas decorations and boxes in the attic - which they had to remove prior to closing ... But they were in perfect condition, even their plastic fake vines and such.
The attics in N. Florida (around Destin, etc.) easily get to 140 degrees this time of year. We measured it the other day ... Some electricians here don't crawl attics in the summer. I even had a problem locating an electrician to run my new electrical outlets for the stereo. One of the electricians threw up upon existing my attic the other day and said last one until November... This said, the heat didn't seem to bother the boxes and other stuff up there.