^^^^ Yep was just about to say that used MTB rings alarm bells (this is a MTB forum?)
almost guaranteed to be opened for inspection and if cleaning required then its another delay and a hefty bill
I used these people a few years ago for a couple of bikes to Aus by airfreight and they are/were good and will help with paperwork (someone here suggested them)
https://www.transglobalexpress.co.uk/
Like others not so sure a good idea…two or three things(at least) to be aware of…if a complete bike probably falls into “volumetric weight” (see FAQ above website) that is charged by dimensions because its all bulk and little relative weight – so needs packing as small as possible…if other party get a quote ask what they assumed?
My limited experience is that customs clearance delays on just standard low value stuff is around 3-4 weeks
Check if the other party understands that they will be liable for GST (Sales Tax 10%) on value at point of entry declared value plus international shipping cost
Oh and don’t put “swopping for broken Xbox” in the value declaration 😉