Sadly this is not uncommon, as has been stated.
FLIR check the production date and if it is beyond the warranty period they check when it was bought, and whether you are the original purchaser. If bought via eBay as a used item you have to rely on “good will” for support. If bought new from a dealer via eBay, your first point of contact will be the company that sold it to you and they will either provide the required documentation to facilitate a return to FLIR or accept the return to them for exchanger/repair. Normal support procedures really.
Sadly if you are not the original (1st) purchaser of the product, warranties can be a little challenging as some manufacturers will only honour them for the original purchaser. Nothing unusual in that.
There have been cases where a warehouse buys bankrupt or surplus stock in bulk and the warranty clock starts ticking from the day they purchased that stock ! Yep, strange but true. They effectively become the first purchaser of the stock. The basically ‘new’ stock is sold on auction sites like eBay and some may have very little warranty time remaining. In such cases if an item fails it is sent back to the supplier/warehouse who likely take the ‘hit’ and provide a replacement.
Fraser