Solid A.I.O for beginners who don't know the difference between the methods.
Just to add for anyone reading this in 2026:
DNA / DMG / EB / PEB - Still the safest for small amounts, but almost every major store now checks weight + photo proof for EB/DMG. Don't try it twice on same store without a good history.
FTID v3 - Still works but only if you keep same ZIP and the warehouse address edit is clean. Most stores caught on to this one.
FTID v6/v7 LIT - Only worth it if their TOS says they are liable for lost in transit. If they use a 3rd party insurer, you'll get denied.
FTID v8 / v9 - Pretty much patched on UPS/DHL now, tracking reroute shows too much info on their internal system.
Insider FTID - 99% of people selling this are scamming, be careful.
For high amounts PR is risky as hell now, Amazon/Zalando actually verify reports in most EU/US regions.
Stay safe and don't double dip too fast on same retailer.