Post: #3

Because timers of items inside a container doesn´t work, at least a long time ago didn´t worked.

PD: Confirmed, Timers inside a containers never fires.

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Another options:

c) Use FORITEMS 9999 just after [FUNCTION f_onserver_save_ok].
If there is a pause for saving the server, there is no problem if there is a bit more delay for a slow script.

d) Other option is using FORINSTANCES i_metal_chest, FORINSTANCES every_container, FORINSTANCES etc..., just before a save. A bit more faster but more complex because you have to define every BASEID of container in your server.