I've not had any problems myself, and post a few ebay items and letters each week. I don't think it is a problem with Thurso post office, as all the mail gets bagged and tied up to be sent to Inverness and beyond.
If you send a card with money in (which you know is not a good idea) never put cellotape on the back of the envelope as this attracts attention that it may have money in it.
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