The fifth house must be relevant but it has nothing to do with children (or sex).
The big clue is in the significator of passports and all the things Mercury represents in the chart. One must think outside of the box, but only just. That is another clue.
Okay Tessie, I ll take a wild, really wild guess here, just "for fun", as you said. I cant read charts properly, but I can do fun
Do I get three tries? ( three is "funner")
So you asked this question from London, UK ( btw, do you speak in cockney accent?) and Mercury is in the 5th - rules fun, games and children = Disneyland !!! - The 5th House At Its Finest! ( well minus the sex) I mean Disneyland near Paris, that is not too far from London, it involves no sex
and is not exclusively for children and the lost object is after all a passport. Mercury in Scorpio - dark places, stagnant water ....so Im thinking you lost it while enjoying one of those themed dark rides/ghost trains, smth. involving water or other attractions. But on the other hand Disneyland Paris is in a foreign country, so Merc. would have had to be in the 9th (I mean I guess).
OK, 2nd try
Mercury in succedent house + fixed sign = not very close too you, but not too far away either ( like in Wonderland or smth
). Mercury also rules your 3rd - close environment = your city. So you lost it in London, in a public space.
So fixed sign - parks, gardens, woods, at ground level, well-hidden + Scorpio - very well-hidden. Scorpio Water sign = stagnant water = lakes or ponds, no fountains ( cos that moving water). So Im guessing a public park with lakes or ponds, "secret" gardens ( no, not "Eden"
), well-hidden - Hyde Park ( see "hidden" -"Hyde", makes sense + people have fun here -5th ) or Kensington Gardens, that s close, right? OK, just googled it a bit ( cos I have visited several major attractions in London, but not Hyde Park/Kensington Gardens) - there is the Long Water (!) and the Serpentine (!!) lakes - do these names scream scorpio or what ?
So you dropped it in one of these lakes, or near the lakes, near the Peter Pan (= you know, the eternal child - scorpio 5th, right) sculpture ?
OK, I dont know what to say for the third - Madame Tussauds?
you know, wax- honeybees - Scorpio rules insects, and its a fun place. You dropped it near Leo deCaprio
Now, just for unity s sake, lets recap - you lost your passport in Hyde Park/Kensington Gardens as you were returning from your trip to Disneyland Paris, and were on your way to Madame Tussauds
OK, my imagination has a "mind" of its own, so, Tessie, do I at least get some points for originality ?