I think it is right to note that the cord matched NOTHING in the Ramsey house and was never linked to the Ramseys at all.

It would appear the tape and cord and other things (rope, stun gun, Hi-Tec Boots)were carried into the house by the killer. That tells a lot about him - - and someone out in Boulder must have had some idea that this guy was involved - - his personality and things he owned... maybe things that went missing after the murder.