[fortune]

I will weigh it once I recieve it.

Lets us know when you've established the exact weight.

I heard of another method, which consists of saying the toothbrush does not charge, and that you disposed of the item

It's called the "disposed of the faulty Item method", which Is known to be a lengthy process.

Alternatively, you can box the return.

I will let you know.

For boxing the return, does dry ice have to be used? Can I not use an item similar in weight?
Do you also have a link that describes the box method?