Forest School (eggshells)

Good Morning, We are hoping to do some more planting in Forest School this term, Could I request those who use eggs in their household If you could save the eggshells for us, bag them up and drop off at the school, it is supposed to deter creatures from nibbling vulnerable seedling, if crushed up and springled on the soil after planting. Thank you in advance for your help. Miss Bentley