I recommend using our 'collection tracking' system to keep track of your personal collection. I do this myself and find it immensely helpful to avoid buying things I already own.
To create a personal inventory,
go to this page
and enter your inventory name ('Rich Personal' for example) into the box that says . After it is created, then you will see it in the list and there will be a button labeled "Use 'Rich Personal' as default Inventory". Click this button to make it possible to one-click add items in the database to your personal collection.
By default, nobody else can see your inventory except you. There will now be a new button on every page to allow you to add items to 'Rich Personal'. I use this feature all the time. This feature also adds a new column to all the checklist pages called 'Have' which shows you whether you own the item already or not.
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