I dont know about the Spit's, but there are a number of UK sites where it has been rumoured that Lancaster parts were buried.
Two of which were at Elsham airfield and Kirmington, (now Blunderside, sorry Humberside Airport), both North Lincolnshire, UK.
I know that some excavation took place at Elsham, along with X ray scans. They did retrieve some parts, which were appropriately wrapped and therefore preserved, but sadly, they were not of any use as spares for the existing Lancasters.
The miserable gits who run Humberside wouldnt allow any searches, although I do know that when the site was being developed over the years, it was very common to come across buried stores, most of which went elsewhere,and not to the appropriate mseum etc.
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It wasn't me.