Bob is replacing a potting shed on Mr Beasley's allotment. In the old shed is a chest which Mr Beasley doesn't need any more. Meanwhile JJ is having a clear-out and has devised a new filing system for his paperwork. While Molly and Skip go to collect the remains of the demolished shed, JJ puts some papers in his old chest while he heads to the shops for some more files. Molly decides to surprise JJ by replacing his tatty old chest with Mr Bentley's better one. Back at JJ's yard she swaps the chests over and sends Skip off to the dump with the old one. JJ returns and is shocked to find his chest gone - with his papers inside! He calls Wendy who goes out with Muck to try and intercept Skip. She calls Bob - but he has given his phone to Mr Bentley who is on his way to the post office with Scoop. The Machines race off in pursuit of Skip, catching him just in time.