But they are allowed to bring personal items on board. The error here was clerical. In fact some of the covers were listed under the personal items section.
So was that wrong? They opted to take those instead of other personal items.
Or, it demonstrates a lack of foresight by NASA to take advantage of an opportunity to sell a bunch of stamps over the following decades at wildly inflated prices.
There must be at least a handful of items that don't weight a lot per 1000 units that could have gone to the moon and back. I'm thinking pretty much any paper document or certificate, cash notes.
So was that wrong? They opted to take those instead of other personal items.