FREE: Lot by Number!

A lot of what?

Would not bid on this knowing what it is.

I understand that the point is for it to be a surprise. However 'Mystery' auctions must have some sort of idea given as to what MAY be included. Here is the Listia policy on Mystery auctions, just so you know.
Listing Content

The listing page is where most buyers will get information to help them decide if they want to bid on your item or not. The content on this page should focus on describing the item(s) and any detail about the terms of the transaction. Your listing may be removed or edited if any of the following rules are violated. The following are not allowed in your listings:

Links, references or solicitations to outside sites, companies, organizations, groups, newsletters or mailing lists. Any links, URLs, usernames, or references to the above in your listing title, description or other fields are prohibited. Exceptions: links provided purely for clarification or further description of the item listed (ie, not to a store or business) or trustworthy charitable organizations.
Description of your seller status or inclusion of any artwork/expressions in the Title or Location field. For example, including "Trusted Seller" or "bid with confidence" is not allowed. Your Listia badges will reflect your seller status appropriately.
Conflicting or misleading product information, including misleading or unrelated words in your title or description.
Misrepresented items.
Mystery auctions that do not hint at or describe the type of item(s). The listing cannot be a complete mystery however the title can state "Mystery Auction."

how big is the box and what are the 5 possibilities?