I don't know why the previous review said this toner is not genuine and sold on Revain.com. I think he/she didn't buy from Revain.com but bought from a low cost seller on Revain. I ordered one day delivery Thursday midnight and received it Saturday morning at 9am via Fed-Ex Express; Thumbs up for Revain Prime 1-Day Shipping for $3.99. The toner cartridges were original from Canon (in a Canon box, printed and stamped by Canon). The toner label might be darker than the original toner that came with the printer. A great suggestion from Canon is that you can use the supplied prepaid UPS shipping label that accompanies the user guide to pack up your old toner and send it in for recycling. Well it would be better if they give us a voucher for a future purchase if they send the toner back for recycling, ths :-). I just tossed a used ink box into a UPS store to be sent back to a recycling center. :-). I registered an account on Canon.com; hopefully he'll make me a special offer later. :-) The ink toner works great with my MF3240 and from experience I have to say that this toner has exceptional page yields.
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