Finding OLD MAC address through Router.

Sir, 
I lost my laptop (Dell Inspiron 5521 15r) and only have its box which contains serial number 6CRC9W1 , order number 920181961 and etc but dont have MAC address. I asked dell about that but they are not helping me to get mac. Please tell me if there is any
way to get old mac addresses through router to which my laptop was connected. Thanks.

You can't. There is no way to know what the MAC was.
The MAC is tied to the network adapter, not the Laptop, and hence not the Service Tag.  Since the Laptop probably had a wired adapter and a wireless adapter,...there would have been two different MACs.
What good would it be even if you knew what it was?

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