[mothered]

Why is the weight for the missing item so important?

If It's heavy enough to register a weight on consignment and the company cross-checks the records on the carrier's manifest, then the SE will fail.

Couldn't i just go for the DNA?

Of course you can. I'm simply keeping your options open.

The DNA Is a universal carrier-based method, hence unless you're SEing a sports car (so to speak) weights and dimensions are Insignificant.