I messaged Disctech and asked why they didn't inform anyone over eBay. They replied "The message was sent with the refund. Did you get that?"
I checked, and the number of clicks it required me to view the reason was truly infuriating, absolutely user-hostile UX from eBay.
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Disctech stated the reason for the refund as "Other adjustment" and there is a "Note from (my eBay username)" attached which includes the same text as the printed paper found in the package:
@foureight84 check your refund for any message they left.
You cannot leave negative feedback on the transaction until 7 days after the refund, at which point most people won't bother. Disctech / discountechnology know exactly what they're doing here.
To anyone who has opened a ticket with their shipping forwarder, you should send them a screenshot of the refund including the reason, which explains the package contents. If your forwarder does not help you, you
should be able to claim a refund from customs for VAT, though I have no experience doing this.