40928 China first day cover collection 1986-2021!!

Incredible collection of unaddressed first day covers from 1986 onwards right up to 2021, sets and sheetlets, many better noted, all covers different (with different cachets, different cancellations), estimated around 2000 DIFFERENT covers, housed in 28 very expensive Lighthouse albums with slipcases. Nowhere to be found so extensive, at such a low price!!