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Short answer, yes, its reasonable. First of all, the police were undoubtedly not told you had only left for four hours. No telling what gossip the were told, but if you want to know, call them and ask what if any reports were written. 911 cad logs will also tell you what was reported.
Don't be afraid to leave your home. Better solution - get to know your neighbors. Believe it or not, they are trying to protect you.
I hope this helps.
Yes, I do know my neighbors. In this case, you asked if police conduct was reasonable. It is. Police enter houses all the time in these circumstances and find bodies - alerted by everyone from relatives to delivery people to utility workers. Its a community caretaking doctrine.
As to your neighbors, their conduct may be less reasonable, unless they were acting in good faith. I realize you feel violated, but since you don't know what exactly happened, perhaps it was not sinister.
The short answer is there is little you can do other than alert the police as to your displeasure, discuss your routine with them and make sure they have good contact information.