I would return them to the seller, any furniture grade finish should be protected by a non-marring packaging, and unfortunately the speakers were not. If the seller did not disclose this nor did they inspect the speakers before selling, it should be their problem to handle. I would not mess with it any more as the seller will likely not accept them back if you degrade the finish in your attempts to fix it.
Any fine furniture store will tell you you never use reactive materials such as plastic on a gloss finish. Movers always use cloth pads and/or soft pile lined burlap to protect expensive furniture.
Any fine furniture store will tell you you never use reactive materials such as plastic on a gloss finish. Movers always use cloth pads and/or soft pile lined burlap to protect expensive furniture.