We get everything nicked on our site. We have had cabbages, whole crops of drying onions, sacks of potatoes in store, lawnmowers, a hedgetrimmer, wheelbarrows, hosepipe, hanging baskets, shears, an old cast iron greenhouse boiler, seeds including saved peas, sweetcorn, even a staple gun all stolen from our site in the last year. We do our best to discourage theft and now nobody keeps anything they value on site, but our crops are always vulnerable. Personally I harvest everything as soon as it is ready and store at home.