That's what I was thinking, however they did come in the same package - the one with the metal travel case and fabric carry bag (neither came with the old portable carry case that it came with when first released). So if it is a batch number thing then there must have been a revision somewhere along the way, either that or one of mine slipped through Beyers quality control!
beyerdynamic T 5 p has so far been manufactured in two different versions.
The product page says:
• gold plated Neutrik mini stereo jack plug (3.5 mm)
• 1/4" adaptor (6.35 mm)
• in-flight adapter 2 x 3.5 mm
• extension cable 3 m
New version supplied with:
• transportation bag
• aluminium storage case
beyerdynamic Technical Support wrote this in an e-mail:
I orginally wrote this information in "beyerdynamic T 5 p: To versjoner".