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That also respawns ???

I opened Oblivion ESM and other plugins that I'm testing, but I didn't set anything as an active plugin, I'm trying to add 3 respawning chests to the IC Market District.

The IC Market Disrtrict is in its own worldspace - so in the list of world spaces select ICMarketDistrict (not Tamriel) then make your chests and drag drop them from the object list to the render window and move into place.

Okay, now how can I make the chests respawnable?
I placed the chests already tested them in game, waited 3 days, did not respawn?

Find the chest in the object window and right click and select edit. The respawns options will be staring you in the face. This should be a custom chest if you are changing this way. See http://savageartistry.darkbb.com/tes-iv-oblivion-technical-info-f11/creating-a-chest-and-adding-items-tutorial-t130.htm for details.

Yeah I selected respawn and they didn't I waited 3 days and no respawn? I even went to another district and waited 3 days still no respawn?

This is the default way for items to respawn, I hear that items will respawn after 3 days of not being in that cell. I had this happen to me (though I did not count the passage of time) with a cupboard I thought was safe to store items in. I lost all the stuff I had in it. And the original items were all that were in it.

Here is a crazy idea: Put a script on the chest that gives you items directly every time you activate it, instead of having it function like a chest. For example (I haven't tested this, but I don't see why it wouldn't work):

scn MYPREFIXGoldChestBegin OnActivate	if ( GetActionRef == Player )		Player.AddItem 0000000F 50 ; gives 50 gold to player	else		Activate	endifEnd

...or a script that would allow you to get the items or open the container, like this:

scn MYPREFIXGoldChest2Begin OnActivate	MessageBox "What would you like to do?" "Receive Gold" "Open Container" "Nevermind"EndBegin GameMode	set Button to GetButtonPressed	if ( Button == -1 )		Return	elseif ( Button == 0 ) ;Recieve Gold		Player.AddItem 0000000F 50 ; gives 50 gold to player	elseif ( Button == 1 ) ;Open Container		Activate	elseif ( Button == 2 ) ;Nevermind		return	endifEnd

Like I mentioned earlier I have not tested this. But this should at least illustrate my point.

You have to wait for 3 days with the cell unloaded. Adjacent cells are still loaded, that's why you don't have to encounter "loading" screen everytime you get into a building and immediately go outside again
To make sure the cell is unloaded, go to a faraway place like Anvil, or Bravil if you don't want to go that far, should be far enough to unload the cell

Trillioth, I'm using items from various mods(COBL/FRAN/MIDAS/EXNEM SKULLS) so I have to ESMify those, which I DO NOT WANT.
So adding to containers was the only way.

Raestloz I will try what you said .

going far does not do the trick - you have to cross a number of cells or save (in some other cell) and reload - faster and reliable