For the person backed off at Sands for winning $7k, you should have run into a restaurant off the property and eaten a meal there for about an hour. Or taken a taxi home and return the next day to get your car. Or you could meet someone at a store or restaurant, and pay them $20 to drive you to your car in Sands (explaining your story that you're a card counter who needs to remain anonymous), have them drop you off as close to your car in the garage as they can get, immediately run with your face down, wearing a different layer of clothing on the outside, and drive away. They won't bother chasing you beyond the property line just for counting, heck, the Bellagio Bandit got away and they didn't follow him off the property.
I remember when I was backed off at Parx for winning a modest $1k, I went to the Applebees next door and had lunch there just so they wouldn't be able to trace my license plate by following me to my car on the camera. I returned from Applebees to my car an hour later wearing a t shirt in the middle of January. But I wasn't chased out by security like you were, I was just politely backed off. I'm sure if I were chased out by security I'd run to a place much further and buy a ride back to my car.
Don't play in eastern Pennsylvania or AC for at least a month, and don't return to Sands for 6 months. Come back with a fake ID 6 months later and get a player's card with it. And if you drive, park in a nearby place or if you have to park at Sands, park near the edge of the lot.
The reason I didn't want Parx finding out my identity is so that my name wouldn't be fliered to other casinos, specifically the Harrah's chain since I was going to Vegas soon after and didn't want to be blacklisted at Harrah's where I had a comped room. And my name is good everywhere else. I plan to play blackjack for years to come, so I want my name to remain good as long as possible, especially when I increase my bankroll to the next level.