[MaximumSandvich]

Basically the title, I recently got a brand new beyer T1 and have been hearing that it's supposed to include a warranty card.

 

[Bozoleclown]

It's a small square leaflet written in many languages

 

[tacky187]

There's the "[size=small]guarantee" booklet that is in many languages which outlines what is covered, but not really a classic "warranty card" that you would fill out and send in.  Check out some of the "unboxing" videos on youtube and you can see if what you got matches those.  [/size]
 
[size=small]You can register your new headphones on their website, but it's been my limited experience that having a bill of sale/receipt from an authorized dealer is what matters most.[/size]

 

[tacky187]

FWIW, I am in a similar boat.  I wrote Beyerdynamic and got this response this morning:
 

[size=x-small]Thanks for your request. It´s no problem to trace back the manufacturing date of your T 1 #XXXX: April 03, 2012.[/size]
 
[size=x-small]In case of warranty claims, the warranty is covered by the dealer where your friend has purchased the T 1. Of course, you will need the original bill of sale. If you don´t get it, and there are any warranty issues, you are free to contact info@beyerdynamic-usa.com . However, in that case the parts only will be covered by the warranty, but you will be charged for the labour cost.[/size]
 
[size=small]In case of any further questions, please do not hesitate to contact me.[/size]

 
So if you can't get the original bill of sale, using your serial number you can at least get the parts for your T1 headphones under warranty.