I thought it would go in one guess if someone looked at the slot glass.

Yeah, I'm not old enough to remember people in more formal attire. Guys in suits and ties. I'm going add the rest. Maybe someone has an idea of the time period when these were shot. I tried finding the Copyright but no luck. None of them are marked © date, but do say GAF Corp. which is a surprise.

Side note from my search, ANSCO eventually took the name GAF = General Aniline & Film. Hanking marketed the cameras from Hong Kong, later Haking bought the company (and the Ansco brand) in 1978. Some reference shows that they later became Anitec, Anitec Image Technology was acquired by International Paper and changed its name to Anitec Image Corp.

I don't know if that means anything that the 1978 date could help date the slides. From the Las Vegas Sun https://lasvegassun.com/news/2000/aug/18/chronology-of-the-aladdin-hotel-casino/

April 1966, Prell reopens the resort as the Aladdin Hotel and Casino.
In September 1968, the Parvin-Dohrman Co. of Los Angeles buys the Aladdin for an estimated $10 million.
October 1971, Aladdin Hotel Corp., led by St. Louis businessman Peter Webbe and longtime local casino executive Sam Diamond, buy the resort for $5 million.
Clue? 1972 -- The Aladdin becomes the first Strip resort to offer double odds on craps.

1980 -- In January, Ed Nigro gains a court-sanctioned takeover of the Aladdin after he and Carson sign an agreement to buy the property for $105 million. The deal falls through. In July, the state once again closes the hotel. In September, Newton and Ed Torres, former chief executive officer of the Riviera, buy the resort for $85 million and reopen it in October.

1986 -- In January, Japanese businessman Ginji Yasuda buys the Aladdin for more than $50 million and closes it in November for a $30 million-plus remodeling project.
1987 -- In March, the Aladdin reopens.

In June 1992, a bankruptcy trustee awards possession of the Aladdin to the JMJ Inc. management company, owned by Joseph Burt... He becomes chief executive officer of the Aladdin and runs the property along with title-holder Bell Atlantic-Tricon Leasing Corp. of New Jersey.

1994 -- In December, the Aladdin and the 36 acres upon which it sits is sold to the New York-based Sigmund Sommer Family Trust

1998 -- In April, the 17-story Aladdin hotel is imploded

August 2000 -- The new $1.4 billion Aladdin...

That's a very abbreviated version.