Sometimes it doesn't matter how you package your product. I've had (personal) packages arrive damaged, after taking great care to protect the contents to a ridiculous level.
This is why I refuse to ship my artwork in a frame with glass:
I shipped a framed wedding gift to a hotel I was staying at. I signed for the delivery, picked it up from the desk that the delivery guy had set it on, and it was quite obviously shattered. Delivery guy was making a break for the door...!
I rather enjoyed lighting into him. Even if he wasn't the *&#$@% that smashed it, when there's a box marked "Fragile!" (on every single side) and you pick it up to hear the sound of shattered glass, obviously there's an issue!
(((sigh))) At least it was my own package. A customer would have certainly found a way to turn that one back on me. It's awful, as we have NO CONTROL over the handling!
(oh. sorry, that probably didn't help...)
As for the website info, I agree with Jen above- I would not want that included on the front of the artwork, no matter how teeny the letters are... Signature on the front, yes.
Web address, etc. should be added to the BACK of the artwork (a stamp or a sticker). That's my opinion...