Most likely reason is the printer is either a display model, or previously been sold and returned. The toner cartridges are usually sealed and these seals need to be removed prior to use. I would recommend returning to the supplier and asking for a new one, with the toner cartridges sealed. Once toner has been spilt, it is very difficult to remove all traces. A standard vacuum cleaner may be suitable to remove the worst.
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Most likely reason is the printer is either a display model, or previously been sold and returned. The toner cartridges are usually sealed and these seals need to be removed prior to use. I would recommend returning to the supplier and asking for a new one, with the toner cartridges sealed. Once toner has been spilt, it is very difficult to remove all traces. A standard vacuum cleaner may be suitable to remove the worst.