No mystery....just simple supply and demand.
When C= went bust, all remaining inventory (well most of it anyway) including spares and partswent to AT. AT contracted with QuikPak to build A4000Ts from remaining parts inventory.
Over the years AT sold alot of Amigas overseas (a large number went to India) and dispersed the remaining stock to anyone who would buy it (dealers). Europe had / has most of it (A1200s) but a small amount is / was here in the states (A4000D, A4000T).
"New" AMIGAS don't stay on the shelves forever.
Regards,
Ltstanfo