Authorities have recovered some transformers stolen from the state psychiatric hospital in Lincoln.

Investigators say the thieves took five transformers and 15 window air-conditioning units overnight on Feb. 20 from a storage area at the Lincoln Regional Center.

Another theft attempt on March 1 wasn’t so successful: A truck backed up to the storage area got stuck in the mud. Investigators found a receipt inside from a recycling facility, where they found four of the five transformers.

No arrests have been reported.