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....How much would it cost for the filter manufacturer to place a plastic seal on each box?
That's done with the FU and seen anecdotes from WM posted/mentioned where a swap out to the orange can has been done. Low lifes are low lifes and are going to do their worst if it's possible. Sad but true. And opening the BD+ box takes a little effort to open the plastic clasp.
While I don't know how the latest iteration of the 'M&H' BD+ is, I've run two older model, one two ocis with excellent results. That said, I got them for less than a third of current price and with the FU now available for less, not a good first choice in that tier filter.