I've had stuff sent to me that was either mis-delivered or stolen off the front step and been treated by the seller as if I were a thief when I complained.
I've seen UPS deliver $4,000+ worth of photographic gear and drop it with a neighbor (who was on probation for felony theft), without getting a signature . . .
I've seen sellers ship empty boxes and use the tracking to "prove" they provided a product.
I've bought from you (Andreas) in the past and have complete faith in you and would do so again without a second thought.
Shipping as much stuff as you probably do (I don't really know how much but it seems like it would be a pretty large amount), I think that running into something like this now and again would be inevitable. The question is, is it more cost effective in the long run to require signature proof (and perhaps lose out of some sales, because frankly, sometimes it's just not possible to be there to sign for some people, of it's inconvenient enough to make the purchase not worth it), or to end up losing money on a deal now and again. There are arguments either way and no clear consensus.