Proper Association

I'm having a hard time how I should approach this but let me explain. I have some reports for customers that are uploaded every day such as regarding status (i.e. usage). Sometimes these reports are very large and I cannot contact all in one day. 

Reports

id | date | created

Then each item in the Report sorted through and then saved to the "Items" database.

Items

id | report_id | name | bid | usage | created

Followups

id | item_id | note | bid | created

What I need is when I pull the report and display the Items in a table for any given Report to display if the customer has been contacted within the last month. I can't do hasAndBelongsToMany relationship because with each report/day brings new items where the data has changed (i.e. id and usage) but the only thing remaining the same is the BID. Would I need to "Join" tables?  Any Assistance would be appreciated.

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