Good work everyone
Sorry if the ideas below have already been mentioned or dismissed ... I am on page 11 and still reading ... but must soon throw some zzzzzzzzzzzzzzzzzz.
I also do not have cIV running on system yet ... need new system

... so these ideas may not be possible to impliment anyway ...
... But here goes ....
Goody Huts and Barb camps ... old spaceware left behind, automated and temporary manned camps, robotic rovers ... all the junk sent and left before the first permanent colonies were sent.
Popping Results
> Cash ... the value of the rare and precious substances used to construct them eg. all that gold our Apollo landers left behind.
> Map ... they were survey units, maybe geological or water searches.
> Explosion ... unstable isotopes caused the unit/facility to explode and damage or kill the unwary or clumsy scout.
> Robot Scout/Worker ... they are found inactive and are either easily repaired or just required a recharge.
> Rogue Robot ... found inactive, but on activation attacks through a malfunction in programming.
> Colonist (manybe specific types) ... find a missing colonist/explorer who went into hybernation.
> Cash ... Artifact, collector's value for finding a piece of space exploration history ... the first (Buzz's ??) golf ball, flag, imprint of the first Chinese astronaut, Mummified remains of the 2020 Virgin Starliner passengers and crew, etc.
> Abandoned Base which can be converted into a settlement.
Defensive Weapon Idea
> Landmine or Bobby trap ... these would be invisible to everyone but the team that placed them ... immobile ... self destruct but with much damage caused ... the target unit walks into it and ... BOOM !!!
EDIT ... Wow got there ... kudos to you all especially the core ... amazing work and dedication 