HINTS：

场景：At the Lost Property Office in London with a Very Conscientious Attendant 

No. 41 bus

it'd been

Mmm... anything else?

flight-bag

aeroplane 

letters -- J.H. 

Excuse me, I wonder if you could help me. I think I left my suitcase on the No. 41 bus last night and I was wondering if it'd been handed in. I see. Just a minute, please! Could you describe the suitcase? Yes. It's a black suitcase with one handle on each side. Mmm... anything else? It's a kind of flight-bag, the type of bag that you take on aeroplane with you. Any other distinguishing features? Well, my initials are on the side in large letters -- J.H. It's rather a large object to leave on a bus, isn't it?