I usually take seeing Killyou's name as a sign of an excellent plugin but this one seems to be quite unreliable and hard to understand to use right Boxes frequently don't spawn where I'm looking (albeit I am trying to fit them in snug places). It also seems to bug out after a while and spams the console with errors:

Failed to call hook 'chatLootspawn' on plugin 'CustomLootSpawns v0.2.13' (NullReferenceException: )
  at (wrapper managed-to-native) UnityEngine.MonoBehaviour.CancelInvoke(UnityEngine.MonoBehaviour,string)
  at UnityEngine.MonoBehaviour.CancelInvoke (System.String methodName) [0x00001] in <7be5e4321c864b0cb854654f411bb206>:0

  at Oxide.Plugins.CustomLootSpawns.ClearContainer (BaseEntity container) [0x0002b] in :0

  at Oxide.Plugins.CustomLootSpawns.chatLootspawn (BasePlayer player, System.String command, System.String[] args) [0x005b7] in :0

  at Oxide.Plugins.CustomLootSpawns.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00ba9] in :0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0