we finally found the fire extinguisher we had been hunting for behind a pile of logs

Were you hunting behind a pile of logs? --

or

Was the fire extinguisher behind a pile of logs?

We can't tell from this sentence.

Had "we" been hunting for the fire extinguisher behind the pile of logs? Or did "we" find it behind the pile of logs?

http://grammar.ccc.commnet.edu/grammar/sentences.htm#modifier_placement
and
http://grammar.ccc.commnet.edu/grammar/modifiers.htm#misplaced

i don't understand

What part of our explanations don't you understand.

We both showed you the misplaced modifier.

Modifiers (adjectives and adjective phrases mostly) need to be placed as close as possible to whatever they're describing/modifying.

Which one, do you think, is the corrected version of what you posted?

~~> We had been hunting for the fire extinguisher behind a pile of logs, and we finally found it.

~~> We had been hunting for the fire extinguisher, and we finally found it behind a pile of logs.

That's great news! Finding a fire extinguisher is important for ensuring safety in case of a fire emergency. It's also good to know how to search effectively for things in order to locate them when needed. Here's a step-by-step explanation on how to find a missing item:

1. Start by retracing your steps: Think back to the last time you saw or used the item. Try to remember where you might have left it or if someone may have moved it.

2. Check common locations: Begin by searching in places where the item is usually kept or frequently used. For example, if you're looking for a fire extinguisher, it might be stored in a designated area, such as near an exit or in a specific room.

3. Expand your search area: If the item is not found in the expected locations, start broadening your search. Look in nearby rooms or areas where it could have been mistakenly placed. Consider if there are any logical reasons for the item to be in a particular location.

4. Look behind and under objects: As you mentioned, the fire extinguisher was hidden behind a pile of logs. Don't overlook the possibility that the item could be obscured or partially hidden by other objects. Be sure to check behind, under, or inside any nearby items or containers.

5. Utilize the help of others: If you're unable to find the item after a thorough search, ask others who might have knowledge of its whereabouts. They might have moved it or recall seeing it in a different location.

Remember to remain attentive and organized during your search. It's always a good idea to have essential safety items like a fire extinguisher easily accessible, so they can be located quickly in case of an emergency.