Selecting Multiple Items For Email

hello once again
Scenario:
I currently have a form that the users can browse through listings of items for sale. While going through the records, they can mark with a checkbox of which items to include in a report to send in an email. The check box is currently part of the listings table, and i then run a query to pull items with the box checked, then put those in to a report, then they can email.

Problem:
about 5 users use this database, so if one user is selecting items that they want it's going to cause a problem for another user to select only the items he wants since it is all updating to the same table. Ex, if I select items 2 and 3 and another person selects items 4 and 5, when I click to show the report, its going to show items 2,3,4,5. Make sense?

Solution:
Since there are only 5 users, I made them all aware of this, and also created a reset selected email checkbox button, that sets the checkbox back to unchecked so the next person can select their own items and email. There has to be a better way to fault proof this, I just can't think of one. Any ideas would be greatly appreciated!