I used the Castles mini-sheet on an ebay package the other day, and I've received the Wildings on auction lots. Don't recall seeing the Castles or the lower denominations from a non-philatelic source.
The only Wildings I ever used were the regular ones. There were two post offices on RAF Lakenheath - a British GPO and a US APO. I quickly discovered that the APO was faster and cheaper.
I was back in the UK in 2003 and used some of the stamps from the Wilding MS on a registered letter .I had to convince the Post Office employee that the stamps were valid,as she had not seen them before or was aware of their existence.
I received a couple on an envelope from a dealer - as a Brit, my hunch is very few were used for everyday post. Probably there will be some value to properly used examples in the future.
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