About warranty seals.
When I worked at a mainstream PC shop, every desktop got a warranty seal after it was built.
It was 100% the same for HW like HP PCs at the late 1990/early2000.
Also my A4000 had the warranty seal, but it had been broken by the importer who added 2MB chip RAM to it, I added HDD, FAST RAM, etc... But still the warranty worked 100%, once the simm socket had to be fixed and once the A3640 board..