Here is what I would do:

Take the valve cover (a.k.a. "cylinder head cover") off.
This will require removal of all connections to and above
the valve cover. Then remove the four cap bolts that hold
the cover on. Bang on the cover lightly with a rubber mallet
to free it. Lift as straight up as possible, because there's
a gasket that can get twisted and get oil everywhere. Now
extensively inspect the exposed region for bits of tin foil.
is the foil magnetic? Re-install with a new valve cover
gasket. Torque the four cap bolts with a torque wrench,
tightening first to half the spec, then 3/4 spec, then full
spec.

Run the car, staying on the lookout for odd running sounds.
Maybe change the oil after running it a day.

http://www.honda.co.uk/car/owner/workshop.html has a manual
for the 95 Civic. It may have illustrations that can help
you.

"deniskrupka" <u42255@uwe> wrote
> Hey Guys,
>
> Forgive me for not knowing anything about cars, but I have
> a problem I really
> need some advice on.
>
> My girlfriend lost the oil cap on her 1995 Honda Civic
> last week. When I
> noticed the leaking oil and the missing cap, I sealed the
> hole with tinfoil
> and tape so she could drive a few days until I got a new
> cap.
>
> Well, yesterday we got the new cap and when I went to put
> it on a pieces of
> tinfoil (small crunched up balls of it...probably 1 cm
> diameter) fell in. I
> don't know the correct name for what it fell in to (the
> same place you pour
> the oil when you're low). Two of the pieces just sat
> close to the top and I
> managed to get them out with my finger, but one (maybe
> more) fell into this
> small hole (again sorry for not knowing the name...but it
> seems that is where
> the oil flows when you pour it in). I can see it a bit by
> looking down with
> a flashlight, but haven't been able to get it out. The
> car hasn't been
> started since then.
>
> My questions are:
> What would be your advice on getting the piece(s) out? If
> I dont manage to
> get it out and they stay in there could this cause any
> problems?
>
>
> Thanks a lot
>