I have had this problem too over the past weeks. Mrs Bat and I have both not received parcels and small packages on several occasions. Retail sellers are usually good about this and ebay sellers have been pretty good too. The local postman acknowldges this a problem nationwide and says that, in our area alone, at least four different courier services are sub-contracted to do deliveries on a regular basis. A case of too many cooks ... he says.
I have had a couple of problems with stuff being send between me and other members but these have all been sorted out in a friendly way. I am sure you will find it the same.
Bats.