Spent grass snake eggs?

Spent grass snake eggs?

Observation - Spent grass snake eggs? - UK and Ireland. Description: Found whilst digging out the compost heap. Grass snakes observed in garden last year. Guessing that these are the egg shells. Shells are now soft and rubbery.

Found whilst digging out the compost heap. Grass snakes observed in garden last year. Guessing that these are the egg shells. Shells are now soft and rubbery.