It beggars belief that the value of a stolen shed could be worth the trouble and effort of defeating the site access restrictions and then risk being caught doing both that and stealing the shed off the plot. Like this incident and burglary etc. generally; don't let them beat you. Yes get a new shed and return to normal, they don't deserve to get both the shed and cause you to change your life. Commiserations.

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"Always willing to learn"