MySky Rear Panel replacement

Hi,

First post here and this seems like a big one.

TLDR: Lost the Rear MySky roof panel and I need to replace it.

Long Story Short: Past weekend my kid was fooling around locking and unlocking the panels and apparently he forgot to lock it back because when I hit the road today and gained some speed it just flew away likeit was no ones business and basically I need a new rear panel.

Do I just contact my dealer? Do I contact my insurance?
Any specific websites I could search for this panel to replace?

Thanks.