Every Secret Box card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Secret Box card is worth
The most valuable Secret Box on this list is Secret Box from Twilight Masquerade at $4.82£3.63€4.24, and the 3 priced copies across 2 sets are worth $6£4€5 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Secret Box is printed in Japanese as well: 1 cards across 1 sets, the most valuable of them Secret Box from Transformation Mask at $2.37£1.78€2.09. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Secret Box sold for $19.71£14.83€17.36.
If you are trying to identify which Secret Box you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: Twilight Masquerade, World Championship Decks.