Amazon S3 PHP API not reading all objects in the bucket

[egamingpark]

I am running a website where electricity consumers can check their latest bill, and every time they check the bill, it's copy is stored in my Amazon S3 bucket named 'wapda'. I call it "Bill History" so that users can see their old bills any time. The bill is checked by a 14 digit reference number and it is stored in the Bucket in this format:

wapda/{company}/{reference}/{bill_date}

Now the problem is, when I retrieve old bills from S3 bucket, it works fine for some reference numbers but sometimes it doesn't. Here is the code:

$key="$company/$reference/";
if($s3->doesObjectExist("wapda", $key)){
	$objects = $s3->getIterator('ListObjects', array(
		"Bucket" => 'wapda',
		"Prefix" => "$key"
	));
	$table="<table class='table table-light'>";
	$table.="<tr><th>Sr.</th><th>Company</th><th>Due Date</th><th>View</th></tr>";
	$count=0;
	$history=array();
	$times=array();
	
	foreach ($objects as $object) {
		if($object['Key']!=$key){ //ignore base key
			
			$fileDate=$object['LastModified']->format(\DateTime::ISO8601);
			
			$time=strtotime($fileDate);
			array_push($times,$time);
			
			$date=str_replace($key,"",$object['Key']);
			$encDate=base64_encode($date);
			$history["$time"]="<td>".strtoupper($company)."</td><td>".$date."</td><td><a href='/history/?reference=$reference&company=$company&d=$encDate'>Open Bill</a></td></tr>";
			
		}
	}
	
	
	rsort($times);
	foreach($times as $index){
		$count++;
		$table.="<tr><td>$count.</td>".$history[$index];
	}
	$table.="</table>";
	
	if($count>0){
		echo $table;
	}else{
		echo "Sorry, currently there is no record in bill history against the reference # <b>$reference</b>. Please try checking latest bill.<br><br><a href='/view-bills/?reference=$reference'>Check latest bill ($reference)</a>";
	}
}else{
	
	echo "Sorry, currently there is no record in bill history against the reference # <b>$reference</b>. Please try checking latest bill.<br><br><a href='/view-bills/?reference=$reference'>Check latest bill ($reference)</a>";
}

The code above is implemented here. Here are two different reference numbers for the company 'GEPCO':

14122460155800
14122460159602

I checked both these reference numbers in the bucket and they exist with some object(s). But when I check the bill history, the first one shows results fine, but not the second.
Here are the direct links:
https://iescobill.pk/bill-history/?reference=14122460155800&disco=gepco
https://iescobill.pk/bill-history/?reference=14122460159602&disco=gepco

Here are screens of both objects in the S3 bucket:
https://drive.google.com/file/d/1IT-8_gYiAkb2EhacRd2z073xSv1GdcGT/view?usp=sharing
https://drive.google.com/file/d/1J--_HS7yUfnSUEAq8RvRcEZklJwbcLKn/view?usp=sharing

As you can see there are a few objects in first reference, and one object in the second, named '08 DEC 23'. The objects from first reference number are loading fine, but not for the second.
Please suggest what should I do. Is there anything wrong with the code, or cache problem or what.
Thank you.