Network object sync problemwith before client login

hi guys i have some problem with network objects sync. in my secene there is a box. if any one of player will touch it destroys. it has network wiev everythings ok about it. if any player touches it lost every clients game thats ok.

but if i destroy my box BEFORE client login client still can see that when he connect.

how can i sync my objects for multiplayer games.

Which networking are you using? Are you using RPC’s?