Police are investigating a report of sheep and turkeys being stolen from the farm in Messingham.
The letter by the poet and librarian was sent to a colleague in Hull shortly before he died in 1985.
Jac Sanderson, 21, a passenger in one of the cars, was pronounced dead at the scene.
The artwork is being auctioned after it was found in a Hastings junk shop 50 years ago.
Messingham Zoo marks Valentine's Day by feeding cockroaches named after former partners to meerkats.
An autograph collected by a schoolgirl who met the star by accident could sell for thousands.
Ashley Kemp is jailed for life for murdering salon owner Clair Armstrong in Messingham.
Ashley Kemp killed Clair Armstrong in a "a fit of rage" at a house near Scunthorpe, a court hears.
Ashley Kemp admits killing beauty salon owner Clair Armstrong but denies murdering her.
