# Message Decoder #6831 — resale value

**Message Decoder #6831** is worth about **$9** loose, based on real closed eBay sales. Sealed or new examples sell for around **$45**.

## Value by tier

| Condition | Value (USD) |
| --- | --- |
| Loose | $9 |
| Complete (CIB) | $23 |
| Sealed (new) | $45 |

Values are medians of real closed eBay sales, updated 2026-07-30. They are estimates for reference, not offers or appraisals — condition, completeness and edition move them a lot, so compare against the sold listings before pricing anything.

## Check the market

- [Sold listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DLEGO%2520Message%2520Decoder%25206831%26LH_Sold%3D1%26LH_Complete%3D1%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-sold&p=md-sold) — the closed sales these medians are computed from
- [Live listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DLEGO%2520Message%2520Decoder%25206831%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-live&p=md-live) — what sellers are asking right now

eBay links are affiliate links: JunkPal may earn a commission at no cost to you.

## Details

| Field | Value |
| --- | --- |
| Brand | LEGO |
| Theme | LEGO Space |

## Message Decoder #6831 (LEGO Space) resale value

A loose Message Decoder #6831 set runs around $9, a complete copy (all pieces + box + instructions) about $23, and a factory-sealed box commands $45.

### What drives the price

Retired sets, completeness (every piece + minifigs + instructions + box), and sealed condition drive LEGO value. Exclusive sets and discontinued themes appreciate the most; minifigs alone can carry significant value.

## FAQ

**What is the best deal for this LEGO Space set?**

The best value depends on your needs; loose is the cheapest at $10, while sealed is available for $150.

**How much is the complete version of Message Decoder #6831?**

The complete in box (CIB) version of Message Decoder #6831 is listed for $20.

**Is the sealed version significantly more expensive?**

Yes, the sealed (new) version of Message Decoder #6831 is priced at $150.

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Full price guide: https://junkpal.ai/products/message-decoder-6831-lego-space-lego
How these values are computed: https://junkpal.ai/methodology
Cite as: "JunkPal price guide value as of 2026-07-30, based on real sold listings (junkpal.ai)"