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There are DoD standards for this. Mostly for SECRET level. Containers for SECRET level material are supposed to be tamper-evident, but not extremely resistant to attack. Filing cabinets must have welded and painted joints, and good locks. It's possible to pry open a secure filing cabinet, but the damage will show. See page 5.3.1 of [1].

The U.S. Navy does authorize label-type seals but rates their security as "minimal". See page 6.3 of [2]

Defense Counterintelligence Agency has some security seal guidelines.[3] Probably outdated.

There are "tamper-evident seals with residue." If you remove them, it makes a visible mess. [4] They also have bar-coded serial numbers. A well-resourced attacker with a lot of access time and a preliminary run to get a look at the seals and have duplicates made could probably remove and replace those. If you're facing that level of threat you probably shouldn't have anything of interest in an unattended laptop.

[1] https://www.nispom.org/NISPOMwithISLsMay2014.pdf

[2] https://exwc.navfac.navy.mil/Portals/88/Documents/EXWC/DoD_L...

[3] https://www.dcsa.mil/Portals/91/Documents/CTP/NAO/security_s...

[4] https://seals.com/security-tape-labels/?_bc_fsnf=1&Classific...

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The engine had been removed, “but its mounting brackets, as well as the fuel and oxidizer tanks, were still in place,” recalled Finer. That was when they hit a problem. The only way to see inside the machinery was to remove a four-way electrical outlet, but it was encased behind a plastic seal bearing a Soviet stamp. The team needed to leave the spacecraft exactly as they found it. But if the Soviets noticed a missing seal, the game would be up. Could they make a replacement in the middle of the night? … “My technicians were working all that night,” Zambernardi recalled. “That night we developed 280 photographs. We also had 60 samples of valves. We had samples of the fluid, rocketry fluid, or what have you.” As they put the assembly back together, the CIA car returned: inside was a perfect counterfeit Soviet seal. They could now reseal the panel and conceal their theft.