If one of them was outside or near a Post Office use that one. It might say 4.30 or 5.00 on the box but there will be unadvertised collections during the day, when the van calls at the PO. (I won't bore you with the tale of my recent expeiences with one day's deliveries acouple of weeks ago, involving two from DPD, one from Amazon and one from RM. Only the last was as expected.)