Colossal had a parcel left and an undated card put through the door saying 'left on the green bin' ( fair enough, the green bin is out of sight and under cover ) - Florence got home before him and the card was retained for future use. On a suitable day, i.e, when he was anticipating the receipt of an extra special bundle of comics, would be home first and the green bin would be collected in the afternoon, the card was left on the mat with the wording altered to read 'left in the green bin' and that day's date added. His safely delivered package was hidden and the trap was laid.
He startled the neighbourhood by running around, hyper-ventilating, issuing foul oaths and looking in all the empty bins - several times...
Oh, how we laughed....