[saint28]

I know that Royal Mail has a non-tracking service, namely 1st and 2nd class, however that's not an option for you.

If goods can be shipped via USPS without tracking, by all means use this In your SE. Again, this Is on the grounds that Lenovo do not nominate a carrier.

I'll use my next email as a sort of affirmation on whether or not I can ship with my preferred carrier. This is the email, any advice on how to improve it? "Yes, I do have a box to ship it in. Can you send me the address where I need to ship it to? I'll be able to ship it out today via USPS and it should arrive by Friday."

Sounds good.

Fingers crossed that Lenovo will be under the Impression It's a tracked shipment. If they simply agree without further Instructions, you're well on the way to a successful SE.

"Please do not send it USPS. I need to be sure we  can track it. Here is a Fed ground label for the shipment." So, they did have a recommended carrier, luckily, it's FedEx. I will respond in a bit saying that they didn't accept the package because of the faulty battery.