I'm certain, I rode to work and it was on the bike. The next morning as I pushed it out of the garage it was missing, I retraced my ride to and from work exactly and nothing was found. My side cover grommets were tight, Frankie's covers are beefed up a bit in the tabs so its almsot hard to get off sometimes. When I looked at the cover on the other side my leg covers the airbox shield at the front and my saddle bag butts up against the back end of it, pretty doubtfull it blew off.
It's always the oil tanks side that people lose or break, so I'm pretty sure some #$%* took it. I'll be on the look out this summer, when I painted it I gave the backside a good coat of rubberized rocker guard. If I see it ill know its mine and whoever owns the bike I find it on is going to get #$%*ed up, or they'll come out to find their bike on the ground. Anyone that owns a certain type of bike or car and steals something off of another of the same is a piece of garbage.